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The 1940s vintage RCA projection TVs using the 5TP4 CRT operated at just under 30KV. I don't know what the life expectancy of the CRTs was, but they did develop a borwn "burn" in the phosphor with use, whcih got darker as the hours went by. The unit Eric showed in his link was the big brother of my unit, which used a 7NP4 (or was it a 7WP4?) CRT operating in the 50KV-70KV range. Very scarey.
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John Folsom
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